*For the first time, a vaginal gel has proved capable of blocking the AIDS virus: It cut in half a woman’s chances of getting HIV from an infected partner in a study in South Africa. Scientists called it a breakthrough in the long quest for a tool to help women whose partners won’t use condoms.

The results need to be confirmed in another study, and that level of protection is probably not enough to win approval of the microbicide gel in countries like the United States, researchers say. But they are optimistic it can be improved.

“We are giving hope to women,” who account for most new HIV infections, said Michel Sidibe in a statement. He is executive director of the World Health Organization’s UNAIDS program. A gel could “help us break the trajectory of the AIDS epidemic,” he said.

And Dr. Anthony Fauci of the U.S. National Institutes of Health said, “It’s the first time we’ve ever seen any microbicide give a positive result” that scientists agree is true evidence of protection.

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